[PATCH 0/4] erofs-utils: add ublk backend for mount.erofs

[Chengyu]

This series adds ublk (userspace block device) support to mount.erofs
as an alternative to the existing nbd backend.

Patches 1-2 refactor mount/main.c: rename nbd-specific types to
generic names and extract reusable source-opening / recovery helpers.

Patch 3 adds the core ublk backend library with per-queue threading,
device recovery, and signal-safe teardown.

Patch 4 integrates ublk into mount.erofs (-t erofs.ublk, --reattach,
unmount).

Chengyu Zhu (4):
  erofs-utils: mount: generalize nbd source types for multi-backend
    support
  erofs-utils: mount: extract reusable source-opening and recovery
    helpers
  erofs-utils: add ublk userspace block device backend
  erofs-utils: mount: integrate ublk backend

 configure.ac        |   34 +
 lib/Makefile.am     |    9 +-
 lib/backends/ublk.c | 1429 +++++++++++++++++++++++++++++++++++++++++++
 lib/liberofs_ublk.h |   53 ++
 mount/main.c        |  506 ++++++++++-----
 5 files changed, 1885 insertions(+), 146 deletions(-)
 create mode 100644 lib/backends/ublk.c
 create mode 100644 lib/liberofs_ublk.h

-- 
2.47.1